linux-kernel - Re: [PATCH v2 0/4] KVM: SVM: Fix unexpected #UD on INT3 in SEV guests

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Date:   Wed,  4 Oct 2023 18:29:33 -0700
From:   Sean Christopherson <seanjc@...gle.com>
To:     Sean Christopherson <seanjc@...gle.com>,
        Paolo Bonzini <pbonzini@...hat.com>
Cc:     kvm@...r.kernel.org, linux-kernel@...r.kernel.org,
        Wu Zongyo <wuzongyo@...l.ustc.edu.cn>,
        Tom Lendacky <thomas.lendacky@....com>
Subject: Re: [PATCH v2 0/4] KVM: SVM: Fix unexpected #UD on INT3 in SEV guests

On Thu, 24 Aug 2023 18:36:17 -0700, Sean Christopherson wrote:
> Fix a bug where KVM injects a bogus #UD for SEV guests when trying to skip
> an INT3 as part of re-injecting the associated #BP that got kinda sorta
> intercepted due to a #NPF occuring while vectoring/delivering the #BP.
> 
> Patch 1 is the main fix.  It's a little ugly, but suitable for backporting.
> 
> Patch 2 is a tangentially related cleanup to make NRIPS a requirement for
> enabling SEV, e.g. so that we don't ever get "bug" reports of SEV guests
> not working when NRIPS is disabled.
> 
> [...]

Applied 3-4 to kvm-x86 svm (1-2 went into v6.6).

[3/4] KVM: x86: Refactor can_emulate_instruction() return to be more expressive
      https://github.com/kvm-x86/linux/commit/aeb904f6b9f1
[4/4] KVM: SVM: Treat all "skip" emulation for SEV guests as outright failures
      https://github.com/kvm-x86/linux/commit/006829954096

--
https://github.com/kvm-x86/linux/tree/next